41 C.F.R. § 301-10.132
U.S. flag air carrier requirement
Anyone whose air travel is financed by U.S. Government funds must use a U.S. flag air carrier, except as provided in §§ 301-10.134, 301-10.135, and 301-10.136.
Anyone whose air travel is financed by U.S. Government funds must use a U.S. flag air carrier, except as provided in §§ 301-10.134, 301-10.135, and 301-10.136.